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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65843271f5bb4a7f648a735303277c12d1ab5f9825cb2b618a8524dd923a844d' 
  AND token = '0GDhSk9wDQNGX+Rne+bUqu3fLvt1wMwzG6L6klFdTRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00174

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}