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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ceb4955d7b99e9ce8a98b7e897b68ff1ff92f49032074cc1dedc8e1f6e4bdfc' 
  AND token = 'YD17Zu/tMlczbvlwe0I1A8VSP546mcE9QUjjUY2j/Ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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