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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4daf154e6664386329dbc5f5f63622102eae7a2f2e0a45ea30a35762b89e26b' 
  AND token = 'gcCJLf3kuYjfGq4YO7wkj/7DK5TzIlwsIbEbOh96w/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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