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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31cf264056d43bfe826a4d9fed9501a7d82ace3b80311c6ab3c7342ec3161c33' 
  AND token = 'KVWHGXg3WPtJXVIMef33ww6lEOiwnUZnPz4Q/6e2hWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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