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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41f5fd0e56fd244b3a66d5e3639e96d1edc7c93239f6c9b871c0e592706ac25f' 
  AND token = 'c5/4LTCYvV9f3zbhK5wDz3DD2yoa2WnRWhS1wirLNos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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