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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51444c7b8724dd03fd24b5750d8cdc84f5303b05af303c857e583bf22960b0cd' 
  AND token = 'lUI0qfEsz06SXGKGII0lEgqvdZrz2awLIDAb+Fm9404=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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