SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09a8825dc861fa3851e3379cd632262f01edf514b807bfc81cac7b6c14df2475' 
  AND token = 'mgJhHKe4CTCZ+e9YaJJzzaSxooOkmr5BIG9ZNJl2EJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00090

JSON explain

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