SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ee1846ee6378badb674f82c4fe302cde31f8ddd6959436dc280f4c2ac20a91d' 
  AND token = 'mMd9ooBs+49SJsV6DUpqvT/zpnjHFxqMC1iEjLU1GyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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