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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e094d9cb7b78a5fabde825f94c62eb025a8602c7ba7e5f8e00481a89f0cb8b7' 
  AND token = 'dkpoyjX5FYnSYJKYe/BDbNgG3k9b7XyNnuqnsVS06zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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