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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9447e06eb4898cc139bed3bb0180a95237d347484e2d715e530bbd5a7e19d313' 
  AND token = '9q8iTudB4c3k9wP8VhYL3JssIg/1ZrQHQVCjC4Iwi48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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