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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9ea9528c99c0c87d52b067e0c8ed19a87c28e8ab80ab9eda04a89c3326bada5' 
  AND token = 'yt9m3IPtUb6qPtdysGXasXpdNUa7cIaI9+xMVvNHqSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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