SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43deba9fcca56431066f157bb12a367d0b599d7fb55b4f5dbe64b2f4450eba07' 
  AND token = 'DQ8qkC2G/j5ZjGGrDL97/HZVYmppEWXIMgqNtLqyRL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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