SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2e437014d3424163f907c6a5c9d1b9c29e06cb4e2cd3904e7500bc269f88d9e' 
  AND token = 'duypYUebQGSwm3WhTk1ZLKzeEw3LXzCqBvJZpBKgbZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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