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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '795f75c663c9d26b1ce1b5ede30e5b5af38c89db7becc76e765350c6b95dc0f4' 
  AND token = 'cnLIhg/LvAW7J7YgK16XM3FzQtIaQZiUVByqRx5/a8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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