SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fa074a5df61a1521c9dc0bc43643ad9f3de7067c365c3b507986bd85795a700' 
  AND token = 'OU5GgZgK2Y4K4ZCRgI5BMvMRX1u8zk/CIsPGQZ4KEdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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