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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a1710fc6722d82737c99d12b4768f421d2463d441c25f1b24f6f433f417e335' 
  AND token = 'AaFYMu+ZiKbnaPGNs9sWHd3po1KrL8rhSW2DBAr/T74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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