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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd33c8dfde3833b6fdd14ddf136e63210136f4dc2973ea7d26d5a6d115eb9ebd8' 
  AND token = 'wRxWdxYsT2rueNjtjqgjJMvdd1sDbW+BJ8qlJpZbHOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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