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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bff9a8226aeca6565ca4d909c86bf319ef85a69196dcd75c64b8799aca38ddd' 
  AND token = 'u8Ger6kJKE1pvDGOKprgxhD/sKFb5wpf4C3KfDrY1tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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