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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c756a82399e2bf78f4b350679beff7f5155ee606777a0ff952b26e84f11391bd' 
  AND token = 'Eqypy9LqfOom79qM88Pq3vcxQYo/OMbhx2MnBg/EG3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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