SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e5de316842138e59a3d7f6cbd44054f96b93bd60a8c751d4fc2c7e34150e1fc' 
  AND token = 'hG/e+0mhAXgyJ/K5bRZj+gLbX8v+RoUe4E8jUrIGFCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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