SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94f8ed0bc7ad50570c068b64bf2a80d39e7a2bb6d576c918a78bb09668945cc8' 
  AND token = 'GddzuJVzXEYQigjEqTF64vaMzGU9YQh+j3tPrpk1J4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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