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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6aea8ecf7123957c91b7efd92afe231070e3d54103aefae960fb53a4df30bb6' 
  AND token = 'qqITABFJFpvnagsNW3jj35Oh2FO6K9Ng9xWkua6QYDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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