SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e035c6243231fd7f17360da85c81bed64b5172f61a6875568fc132c6821f44ef' 
  AND token = 'YtwxUXX95n24ia/+KanUZsj0NsbrqjCuYEIi1PFJ2qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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