Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dadf1eeca1472ca594ae49423d2c33e1ec661b0b032bd3c9efa709b912da2852' 
  AND token = 'c5Ukahpj41R4RCz6Lawc6qVa7sx6rlpePYgjeg5IpJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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