Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19f01e68a3ef3c9b1459ccb92e0130e19254b07478fd0b7c529a50ff42098a54' 
  AND token = 'tTUI/ieAd58IUuKqJyyQOeHvYwuKe5uJlqaix2Doa0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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