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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '007e1cbbf48235c3b7f307189f0ab124b86e3a773fddc7d9f471ed5dfc8c105b' 
  AND token = '3PPQbquLbYdyqkTiU9/nY+Z5vswVwgUvfVm0gatS8YU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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