SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c944ae436576bfc4d02dc3fc24fb94955904b7257fc355eb1ee69a6d15783783' 
  AND token = 'vi/yB9D4DuMWwVuZHCwPIvu3D4BMGumgFlmAHwIpRiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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