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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c33df841be8db204729b270bfc8e31c35c59de4912d4d89fb139a7fedd1b5a69' 
  AND token = 'Gml0ZiDAlPPW7DQ6XC9vroX6jFZFSdoDuN3QjkUNizc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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