SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03056e5dc9fca6976145766427cd9e8c8688433123342a3ee2ff5eb71975460d' 
  AND token = 'DIpf3QLpl/fJRzauWoFqJC1KVLNPIWvyODDvUDiVgqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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