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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5ff84ac3395fa1db4f87252cd1d43f2853f72b4d93b71f45e5ae066f84cbf13' 
  AND token = '0ibqUfdGpT5bZ5OCaImeG0dCrTRTfm8XScTBoFhvcQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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