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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '393690c4248a50e34ef3d617eaa49afff7c1af0c807d372ec960967ebd8c48f7' 
  AND token = '7RwGUlMCXWYzDImjTt5HUQzmaKcDoiHbBAX0XFNxXo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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