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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7676874446a845babeee21097944304f67e5b996b8fe725c7f08fe6998b05bc7' 
  AND token = 'qyIsFjUeeYU3nCYjFPEEX/ZKsFPuRv8/fIHUgnTJXgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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