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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e76a3c8a20079ce58b968cbcd6114bdf7a30187f7dc085aef0cd61c662be4ecd' 
  AND token = 'Qk07WXuNeOi4q+1q5Npykvy5sUXunAxhPVGrBkj1hFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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