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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19cc19ec4f7c63e021d783a9f2a55a654e0f192a622c6adf4627445a59c80228' 
  AND token = 'iCitvojOEHuDeJjnk0SlL8VEGaX8ZYONW6cJ5DtJD6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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