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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '627969dfc69c0172245a44e3b5dc1fd3daed9d3d8e7c5f2f3c54e55bb8a0cc6b' 
  AND token = 'q8NXL8Tdu1GOot+S2EVmNiKv9d4EkU60aiV3MkL7rk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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