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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b22cf5ac4631ccaed7530691205d694b49f349787a937bba85cf736613f93af' 
  AND token = 'P53c34ekzQPnwI0qAvF+QcB5W+FfEOXIYjfHHHWORt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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