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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7bd594975a7ce7fe2ebb8b233a469b13b82a750a8a607417cb2ccfedf06b965' 
  AND token = 't/VOMEjFoD9VD2h+GRGI5E7zm6bIOGiFxU8NF/3wUwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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