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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aecc79e3686683199d2be64ed783e13779f1ec25f35d0a40042edb8d7348654e' 
  AND token = 'BIlwBeqcLirG8QTuMJ47KH/ZsEW5/7k5+M22q4Aonoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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