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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5844004bf4eb23bd7e337038d6e6f645f1373db787ac08e58afbc9e41002b9b2' 
  AND token = '634jAYtWQu6ewW88fKlPrG04bJqZK8msM36hRAmCkf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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