SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2dcf3830f935adf15db3d1b552a87bce4d1798625f6fce2a191b21a397ed306' 
  AND token = 'A42pYHDnLj5LKrQwWHzn2Yh51PmflWBaf1N+vcqUYvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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