SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aec61c5c746b403821f1401d60f3881edee7f1c85a2f79c5e68f361f6952699' 
  AND token = 'nY1lXCeH6khWqHphoEPSsD+7CmMfhLvnxsQJyNwZVb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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