SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32b51c30943eba82154a4ab293df7c7ad476c19c793f84a6614f343f679475b1' 
  AND token = 'QngNMakZpAvviLRjvV+CJfbgGNKtFLCkTGNyqZgIVNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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