SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52fa669b4751fd512a608fe173f92416708d72ec5c42882d827fd90b01bf4a2c' 
  AND token = 'YhtFeCw/o4sKpP+I/XuovqSY+SXaq6Cj4VAbz3H72ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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