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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '525559cc87328178468c33bc7b407c72116c1823fcdc1cf99045a947c5804870' 
  AND token = 'NZiEK6y1VFpIGWtO42CjqeHNTGJytGS0Of1k1rytGUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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