SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd588ff87658ec698113ec8095f95e9b912a0e703773ba2f2c520339d9bc3644' 
  AND token = 'aogulWXTqGY1oiBmHROCL9+AUjonqjw+z5OanN5Exdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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