SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c524f7d109b3210421d2d9b2d6b7fe4cf7c4348ab19685c6fb7fc553273460c6' 
  AND token = '0kjJrb7qM8KAHYpWIWp8iqCPPnHaXEG/HGuKA8iUE1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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