SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2292db3ea187152974c24e3171969989bb13fe23881e49146668f0d46fd0cda9' 
  AND token = 'WrBeSsIUlKvQyuhOHX2ApynEPGZNrizaj8w3YFeYo+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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