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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fdf85c41ee6b5a5595a8c14136ca918bb48482f6a118fd0ea2492a137636e9c' 
  AND token = 'Japd3yX7TFSo5E5fLhqM92tmBxuRi/CngdQDU7Wt/Ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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