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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d8e9e31ebfe9ac5e07a36a53885cf7065eb75a953908b9f54742fa33985adbd' 
  AND token = 'B3XcKhV1I6GfbP1zukFwW19D6vVB91ofpLs0OOVKcSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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