SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae2343a9c182d5dca7f8345d7d13a192dc181f253edd94fb0c8c94ec76b864b8' 
  AND token = '/bYlwQsn+G6k9dzvXPdBgmoRwvGMFh8XcEvUOPSL00g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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