Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccc5c60d45f81be52bd0e7201dbfa813cd83098a10dfc7f3d1609dd2cf9bb1ae' 
  AND token = '51x9NA2d7IrUpNin086NWgW87NfSrKMXbOedRjqcSNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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