Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51c0f0c4667b383129243d81ec531022841bdacd461335bb5cf723d25346677d' 
  AND token = 'lko0w2M66XqMAnlXk2tgV1rI8J0yBQHyo2sXiEvxlNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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