SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd58445dd18c92dc37b09d7d280b7a8e643a19a73bf8fd753cff67d2f204fa2da' 
  AND token = 'wVWx+4Oh/yMJpaVEFOY1wY16PmpZGn3IVc3nVaB5XTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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