SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c6bf26dfa85c51e5f831f3f958297c740630658804606eed6e6dcbf58f5a7d9' 
  AND token = 'y7mv61XgtPjoBg/YQByWWcG/jGO7ft8pKI/HRZPOCPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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