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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a9a30f5a6b9dee7d79ab7c7eb76b77e76c698ad9af7400bcc3365e7a0f89672' 
  AND token = 'GeK5DMZKKpI3LIHvY/Iu+tk/z5lPq3ZTQSRYec6fRUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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