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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '134b2663aeb202d236ed0dd54cee545093efd1df57288ea244a84e0dc0c5ee17' 
  AND token = 'nZDkGI0hBnu+fpGAtJ7/AJmdcB4QPvJr2uhLJ7jahM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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