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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43732d153d7d115903b0d141d731f5c875098dda57f2a99c0340c5fced068024' 
  AND token = '2ajx6FNgUcT8I4uDjxbRHSzqh5CnVGu7tU47lyi47cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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