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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed4b9f3dd3d6b4cbf84af4308ede1b88ec26124bd71bd7e41ee1a59301cac337' 
  AND token = 'Wmat822xXeO/ocaUsoFmUvYT6tF8TvcHEwruXsgXtfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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