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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd72a245da61c22f529c5a3eec2835f2f9b4f001035822cb2857304ae46dd972' 
  AND token = 'OuQHcj05vmw6d7F5x+jmHXt/YYUjpM/6k0YpcpK3K1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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