SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f68cb1232099e2f5beec89c05d2c80324f7cb76d4177299b956d31238be903f' 
  AND token = 'oHvZ6IJn1dWKaqBRj2vy9PzgQSf8OUkMgzW+cA3Dwfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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