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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '040ad95a622b3d516705de61f1c7f79b8fb576cc68dec37e8bc83100e15b50a4' 
  AND token = 'toBIZV5GspYaPX7gfuDfajfztUr9lgNYAjfzyRnerVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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