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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90af609eca88942dce3044f76767e3491a22ea9d7f8a83b66f13d076ef71276d' 
  AND token = 'xfrfk+n94RKnDQ0hVoAYukUQIvO3Dp4hz6hRc5yH2aA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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