Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f347e65bbba1e436280499e7d777813005aa51d9afed7dd7144df981c9a039c' 
  AND token = '+bmesSQaZ7MNqmADKuEs1QoTyHvUKSwL5uQgbwceGac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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