SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2418017086ab9a93f21a259d6f206766497dcac1a7885e853c3466f3d4f64ce0' 
  AND token = 'c/BdTKLUMtGBEWztvxw/l5KCT/o+6lqJfuVKrwDGE+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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