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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31deea5258fd444564b50d7f9e9c3ec95fbf294066b587e8e1c1ff233c0320d0' 
  AND token = '1/2BEdDQJVpfloaUqVbufM2Gv1icqRw07WM1aePIEFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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