SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27062c28a466a7acb923a41910f2323e13d3aa5c568b6f036d6a441117e9f958' 
  AND token = 'hXXbGNBPJdpX+YynOXZsE8+zmUfctSg4xsWR860w7Iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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