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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0abf05b5b0aec1eeca198be1d84c05b473c7c24d541711cf031b70f3ae74d0e' 
  AND token = 'OZMeXWvDmdPSbr9oKXgg9d1PiPqbzmd/jQthH8efJtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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