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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1f1b0728bca8ba6443ca9a8347a8b28c3801b49e61d280cac19688e660183e8' 
  AND token = 'Wda0YaISC/Xd3j9OIIKQ78xa2C+qEm04O6oZKwyeEjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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